Adds yarn, updates travis to install using yarn

Yarn does not yet jive with bower, when it does this build step will be removed: yarnpkg/yarn#896

.travis.yml

@@ -6,7 +6,11 @@ cache:
   directories:
   - node_modules
 before_install:
-- npm install -g gulp bower
+- npm install -g yarn gulp bower
+install:
+- yarn install --force
+- bower install -F
+- gulp build
 after_script:
 - codeclimate-test-reporter < reports/coverage/report-lcov/lcov.info
 notifications:

README.md

@@ -25,13 +25,13 @@ Logging in to the SUI requires a running instance of ManageIQ. Instructions on h
 `git clone git@github.com:ManageIQ/manageiq-ui-self_service.git`.
 - Have nodejs **v6.7.0** and npm **3.10.3** installed ([NVM](https://github.com/creationix/nvm) is a popular solution 
 to manage node and npm versions).
-- Have bower and gulp globally installed.
-  - `npm install -g bower gulp`
+- Have yarn bower and gulp globally installed.
+  - `npm install -g yarn bower gulp`
 
 ### Install Dependencies
 
 - `cd manageiq-ui-self_service`
-- `npm install`
+- `yarn`
 - `bower install`
 
 ### Setup

package.json

@@ -11,7 +11,7 @@
     "url": "https://github.com/ManageIQ/manageiq-ui-self_service.git"
   },
   "scripts": {
-    "init": "npm install",
+    "init": "yarn install",
     "install": "bower install -F",
     "postinstall": "gulp build",
     "start": "node src/server/app.js",
@@ -74,11 +74,11 @@
     "karma": "^1.3.0",
     "karma-chai": "^0.1.0",
     "karma-chai-sinon": "^0.1.4",
+    "karma-chrome-launcher": "0.1.4",
     "karma-coverage": "^1.1.1",
     "karma-growl-reporter": "^1.0.0",
     "karma-mocha": "^1.1.1",
     "karma-phantomjs-launcher": "^1.0.2",
-    "karma-chrome-launcher": "0.1.4",
     "karma-sinon": "^1.0.4",
     "lodash": "^4.15.0",
     "merge": "^1.2.0",
@@ -102,6 +102,11 @@
     "body-parser": "^1.15.1",
     "express": "^4.13.4",
     "http-proxy": "^1.15.1",
+    "imagemin": "^5.2.2",
+    "imagemin-gifsicle": "^5.1.0",
+    "imagemin-jpegtran": "^5.0.2",
+    "imagemin-optipng": "^5.2.1",
+    "imagemin-svgo": "^5.2.0",
     "jshint-json": "^1.0.0",
     "morgan": "^1.7.0",
     "serve-favicon": "^2.3.0"